Machine for making sand molds for castings.



No. 628,034. Patented July 4, I899.

'H. E. PRIDMORE. MACHINE FOR MAKING SAND MOLDS FORGASTINGS.

(Application filed June 6, 1891.)

(No Model.

ammtom Hen yi rz'dmore UNITED STATES PATENT OFFICE.

HENRY E. PRIDMORE, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE MCCORMICKHARVESTING MACHINE COMPANY.

MACHINE FOR MAKING SAND MOLD S FOR OASTING S.

SIECIFICATION forming part of Letters Patent No. 628,034, dated July 4,1899.

Application filed June 6, 1891. Serial No. 395,406. (No model.)

To all whom it may concern: 7 I

Be it known that I, HENRY E. PRIDMORE, a citizen of the United States,residing at Chicago, county of Cook, and State of Illinois,

have invented certain new and useful Im-' ing of the operation offorming such molds and the construction of asimple, practical,inexpensive machine for that purpose.

In the accompanying drawings, in which like letters refer to like parts,I show a form of the machine to carry out my invention.

Figure 1 is a side view of the machine, showing a flask and bottom boardon the patternplate and in dotted lines the parts turned over,so thatthe pattern and pattern-plate are on top of the flask and bottom board.Fig. 2 is a top view of the machine, showing a pattern positioned in thepattern-plate. Fig. 3 is alongitudinal section through the machine,pattern, flask, and bottom board, the flask being shown filled withsand. Figs. land 5 are cross-sections through the machine-pattern,flask, and bottom board. I

The pattern-plate A, fitted with a pattern, is mounted on a frame B,which by suitable means, such as the legs B, is brought to a height mostconvenient for the workmen. An upstanding part of the frame B serves asa pivot for the pattern-plate 'A and to support it at one end, while theother end rests upon a supportas, for instance,.the upstanding rib Bwhich is at sufficient height to keep the pattern-plate practicallylevel. This patternplate is fitted with steady-pins A, that fitintocorresponding holes on the flask C and hold the flask in position on theplate. Attention is called to the fact that the steady-pins are in thepattern-plate and not on a fixed part of the machine. This constructionallows the pattern-plate to be loosely pivoted on the frame of themachine and the joint built with-,

out particular care, as the flask always retains the same positionrelative to the patternplate-an essential requirement-and werethe-steady-pins otherwise situated the flask might vary its position onthe pattern-plate and the mold be injured. It is readily seen that theflask C could be fitted with the steadypins and the pattern-plate withthe holes, as the object is to maintain a definite relation between theflask and pattern-plate.

, A handle D serves for the pivot-pin of the pattern-plate and extendsdiagonally across the flask C to the handle A on the patternpl'ate A.

, In making molds by machines the rapid duplication of the mold is theessential object, and any construction by which the machine can beoperated with greater rapidity by the workman is of prime importance.The handle A on the pattern-plate and the handle D, which extends acrossthe flask and bottom board to the handle A make a very convenient meansof keeping the parts tightly together when they are being turned, andthe handling of these parts is handy and very rapid.

Heretofore clamps, hasps, and snaps that must be locked andunlocked havebeen used, all of which have required for each mold several extramovements on the part of the operator to unfasten the flask from thepatternplate. Neither have the constructions heretofore used beenconvenient for the holding of'the bottom board upon the flask and theturning of the flask and bottom board over while still holding the moldto the pattern.

Upon the outer end of the frame B are brackets B of suitable height tohold the flask C and the bottom board when theparts are turned over.These brackets B are made adjustable on the frame to accommodate flasksand bottom boards of varying heights and can be set level or oneslightly'higher than the other, according'to the shape of the pattern,so that the pattern will the more easily be drawn from the mold.

In operation the pattern is mounted in the pattern-plate or, as shown inthe drawings, integral with it, the flask is placed on the steady-pinsand parting-sand sprinkled onto the pattern and plate, if necessary, andthe flask then shoveled full of green sand, care being taken not to ramthe sand into the deep parts of the pattern with two much force.

The flask is then covered with the bottom board, the clamping-handlethrown over the flask and bottom board, and the pattern-plate is clampedto the flask and bottom board by the operator and the whole turned over.The operator then loosens his hold on the handle and turns thepattern-plate back to its former position.

It will be noticed that the pattern is drawn from the sand as thepattern-plate is thrown back on the arc of a circle of which the pivotof the pattern plate is the center. This curved lift of the patternmakes it necessary that the pattern be thinas, for instance,stove-platesor that the side away from the pivot shall curve toward thepivot with as great a degree, or greater, than the curve described bythe pattern as it is lifted. It has been found that if the end of theflask nearest to the pivot drops a trifle from the pattern-plate whenthe parts have been turned over the mold will draw slightly from thepattern, and the raising of the patterm from the sand in the flask willbe facilitated and less molds be injured. In all the rock-over machineswhich I have seen the molds formed were shallow ones, and the sand couldbe so solidly rammed into the half-flask that it could be turned overwithout the sand falling out. IVhen, however, as has been mentioned,patterns with deep depressions are molded, the sand must not be toovigorously rammed, and a bottom board becomes necessary to hold the sandin the half-flask when it is being turned over.

Having now described my invention, what I claim is- 1. The combinationwith a pivoted patternplate, of means for positioning a flask thereon atone side of a vertical plane passing through the axis of the pivot ofthe plate, a handle secured to the plate, a bottom board, and a secondhandle on a movable clamp passing over the bottom board upon the flask,said second handle being adapted to be seized by the hand of theoperator d uring the swinging of the plate.

2. The combination withaswingingpatternplate, of means for positioning aflask thereon, a bottom board and a pivoted handle arranged to be seizedby the operator to hold the bottom board upon the flask and retain theflaskin place, said handle being arranged to turn on its pivot as theplate and flask are swung over.

3. In a machine for making sand molds for casting metals, amachine-frame havinga ceiltral raised portion, to which is pivoted thepattern-plate, a support on one side of this pivot for thepattern-plate, a vertically-adj ustable support 011 the other side ofthe pivot to receive the flask and bottom board and means for clampingthe support in any of its diiferent adjusted positions.

4. In a machine for making sand molds for casting metals, a frame, apattern-plate pivoted to the frame, supports on the frame on each sideof the pivot of the pattern-plate, the support on one side of the pivotbeing adjustably attached to the frame and capable of being placedhigher at one part of the support than at another and means for clampingthe support in any of its different adjusted positions.

5. In combination in a machine for making molds for casting metals, apattern-plate to which the pattern is fixed, pivoted to the frame of themachine at one end, a horizontal oneway pivot on which the pattern-plateand pattern are swung in a vertical plane, a handle on thepattern-plate, and a clamp to hold the flask upon the plate, whichconsists of a handle that is pivotally attached to the machineframesubstantially at the pivot of the pattern-plate on the machine-frame,and which passes over the top of the flask and is brought close to thehandle on the pattern-plate.

6. The combination in a machine of the nature described, of a pivotedpattern-holding plate adapted to hold the flask in position, a handleextension therefrom, a flask, and a suitably-bent handle which servesfirst as a pivot for the pattern-holding plate and second as a clamp bypassing across the flask to the extension on the pattern-holding plate.

7. The combination in a machine for making molds for casting metal, apivoted pattern-'

